Ch20 Biodiversity6.pdf

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University College Courses
Spencer Barrett

BIO120H © Lis| Page 611  Steve Hubbell et al.  even though tree species might be specialized for diff. kinds of germination sites, which species actually invade a gap depends more on the vagaries of recruitment than on envmtal conditions of the gap  competitive exclusion decreases and diversity increases (self-accelerates diversity)  Richard Condit et al.  species in more diverse forests exhibit less variation in growth ad survival rates  higher species richness is associated with more similar life histories Herbivore and Pathogen Pressure  Daniel Janzen  herbivory is responsible for species richness in tropics  herbivores feed on buds, seeds, and seedlings of abundant species efficiently enough to reduce their densities  allows less common species to grow in their place  abundance makes a species vulnerable to consumers – pest pressure hypothesis  consumers locate them more easily 
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